Just noticed their website is down (see below). I am sure at some point they will be back up but my main concern is the same as before:
Lack of any regulation and accountability for the exchanges (wild wild crypto world).
-At any point this exchange (HitBTC) might steal everyone's funds and close the doors.
That is why I urge to keep an eye on this crooked company and alert others to be aware.
This page (https://hitbtc.com/account) is currently offline. However, because the site uses Cloudflare's Always Online™ technology you can continue to surf a snapshot of the site. We will keep checking in the background and, as soon as the site comes back, you will automatically be served the live version. Always Online™ is powered by Cloudflare | Hide this Alert
Can you describe the exact way you go through to restore your wallet? What error message did you encounter? Your seed should be consist 28/29 English words and you need to be fully synced before you can restore your wallet from seed.
Well, you should recover your wallet by initializing a seed if you want to use your old seed (seed A) with it's generated address. wallet init-seed should be the command to initialize existing seed without sweeping your funds to a new wallet. If you launch Sia-UI for the first time on a computer (or delete wallet.db from the Sia Data Folder), you should get the option to Load a wallet from seed to initialize an existing seed with your old address without sweeping your funds. Click here for picture
The method you use is to recover your funds to a different address generated by a different seed (seed B). This is the sweep method. Address will not be transferred since they are generated by different seed. The Recover Seed button after you create a new wallet will sweep your funds from your old seed to the new seed. Click here for picture